#gb{
    width: 600px;
    margin: 0px auto;
    border: 5px solid #66ccff;
    position: relative;
}
.layui-form{
    margin-top: 0;
    margin-left: -30px;
    padding: 20px;
    width: 600px;
}
.header {
    height: 30px;
    background: #66ccff;
    padding-left: 40px;
}
.header span{
    display: inline-block;
    height: 30px;
    line-height: 30px;
    font-size: 20px;
    color: #fff;
    font-family: "楷体";
    font-weight: bold;
}
.exist_msg{
    color: red;
    width: 150px;
    padding-left: 0;
    display: none;
    margin-left: -30px
}